Featuring the unique miracoil zoned spring system you can enjoy the best posture possible while sleeping on the silentnight helsinki miracoil geltex pillow top mattress the mattress also features edge to edge support providing more personal sleep space zoned support for perfect spinal alignment and pressure relief for a comfortable nights sleep it is hypoallergenic which keeps the mattress naturally dust mite freedimensionssingle w 90cm x l 190cmdouble w 135cm x l 190cmking w 150cm x